P55 is a "category code," which means it's non-billable. Billable codes require more specificity. Use the list below to navigate to codes that are more specific:
10
P55.0
Rh isoimmunization of newborn
Billable
10
P55.1
ABO isoimmunization of newborn
Billable
10
P55.8
Other hemolytic diseases of newborn
Billable
10
P55.9
Hemolytic disease of newborn, unspecified
Billable